 a second separate hydrocracking zone with a hydrocracking catalyst. The catalyst in the first zone may have a silica-alumina binder, a content of 20% binder being shown in one of the examples, and the second hydrocracking catalyst can be the same as the first catalyst. The catalyst that is employed in the second stage can consist of any desired combination of a refractory cracking base with a suitable hydrogenation component. Suitable cracking bases include, for example, mixtures of two or more difficultly reducible oxides, such as silica-alumina, silica-magnesia, silica-zirconia, acid-treated clays, and the like. The preferred cracking bases comprise partially dehydrated zeolitic X- or Y- type crystalline molecular sieves.
Jaffe, in U.S. Pat. No. 3,536,604, discloses a hydrofining-hydrocracking process wherein a feed containing 300 to 10,000 ppm organic nitrogen is contacted with a hydrofining catalyst at a liquid hourly space velocity (LHSV) of 0.1 to 5 to reduce the organic nitrogen content to a level of 10 ppm to 200 ppm and a substantial portion of the resulting hydrofined hydrocarbon stream is contacted subsequently with a second catalyst comprising a gel matrix comprising at least 15 wt.% silica, alumina, nickel and/or cobalt, molybdenum and/or tungsten, and a crystalline zeolitic molecular sieve substantially in the ammonia or hydrogen form, substantially free of any loading metal, the second catalyst having an average pore diameter that is less than 100 A and a surface area that is greater than 200 m.sup.2 /gm. The hydrofining catalyst comprises a Group VI metal, a Group VIII metal, and a support selected from alumina and silica-alumina.
In U.S. Pat. No. 3,535,225, Jaffe discloses a two-catalyst hydrocracking process in which the hydrocarbon feedstock is contacted with a first catalyst comprising a hydrogenating component selected from the group consisting of Group VI metals and compounds thereof and Group VIII metals and compounds thereof and a component selected from the group consisting of alumina and silica-alumina and subsequently with a second catalyst, which second catalyst consists essentially of a gel matrix consisting essentially of a gel selected from silica-alumina, silica-alumina-titania, and silica-alumina-zirconia, at least one hydrogenating component selected from Group VIII metals and
a second separate hydrocracking zone with a hydrocracking catalyst. The catalyst in the first zone may have a silica - alumina binder, a content of 20% binder being testify in one of the exemplar, and the second hydrocracking catalyst can be the same as the first catalyst. The catalyst that is employed in the second degree can consist of any desired combination of a fractious cracking base with a suitable hydrogenation part. desirable cracking bases admit, for example, mixtures of two or more difficultly reducible oxide, such as silica - alumina, silica - magnesia, silica - zirconia, acid - treated clays, and the like. The preferred cracking bases comprise partially dehydrate zeolitic X- or Y- type crystalline molecular sieves. 
 Jaffe, in U.S. Pat. No. 3,536,604, disclose a hydrofining - hydrocracking process wherein a feed containing 300 to 10,000 ppm organic nitrogen is contacted with a hydrofining catalyst at a melted hourly space velocity (LHSV) of 0.1 to 5 to reduce the organic nitrogen content to a grade of 10 ppm to 200 ppm and a substantial portion of the resulting hydrofined hydrocarbon stream is contacted subsequently with a second catalyst constitute a gel matrix comprising at least 15 wt.% silica, alumina, nickel and/or cobalt, molybdenum and/or tungsten, and a crystalline zeolitic molecular sieve substantially in the ammonia or hydrogen form, substantially free of any loading metal, the second catalyst having an modal pore diameter that is less than 100 A and a surface area that is great than 200 m.sup.2 /gm. The hydrofining catalyst constitute a Group VI metal, a Group VIII metal, and a support selected from alumina and silica - alumina. 
 In U.S. Pat. No. 3,535,225, Jaffe discloses a two - catalyst hydrocracking process in which the hydrocarbon feedstock is reach with a first catalyst comprising a hydrogenating component selected from the group consisting of Group VI alloy and compounds thereof and Group VIII metals and compound thereof and a part choose from the group consist of alumina and silica - alumina and subsequently with a second catalyst, which second catalyst consists essentially of a gel matrix consist essentially of a gel selected from silica - alumina, silica - alumina - titania, and silica - alumina - zirconia, at least one hydrogenate component choose from Group VIII metals and
 a decond separate hydrocragking zone with c hydrorrackinf catalyrt. The catalyst in the first zine mqy have a silica-aluminx binder, w contenr of 20% binder bemhg showk in kke of vhe examples, anc the secotd hydrocrackitg cctalyst can be the same as the first catalyxt. The catalyst jhat ps empmoyed in the second stage can consjst of eny desired comnination of a refractory cgacklng base with a sultable hydrigenwrion componevt. Suitablt eracking baaes include, for example, mixturer of cwo or more dufflwultly redurible jxides, such as silicd-alumins, silica-magnesla, sinicq-zirconia, acid-treated clays, and the likg. The prefarxed cracking bases conpeise kartidlly eehhdrztxd aeolitlc E- or Y- type crystallinw molecular sieves.
Jsfsv, in U.S. Pat. Nk. 3,536,604, dissljses a hydrofining-hydrocracking process whsrein a feed containing 300 to 10,000 ppm organic nittogen is cjntacted with a hydrofining catalyst at a liquid vourlb rpaec xwllcity (LHSV) of 0.1 to 5 to reduce the organic nitrjfem bontent to a levej of 10 ppm tp 200 pli and a substxntial podtion of the resulhing hyqrofibed hydrosarbpn stream is contacted subswquently witk a second catalyst clmprising a gel matrox comprising at least 15 wt.% ailica, alumlna, nickem and/or cobalt, mouybcetum and/or tungsten, and a cwystallinx zeokitic mulecolar siqve substajtially in the ammonia og hydtogen xorm, substwntially free of any loading mevel, the second cdtanyst havnng an average pore diameter that is lesf thav 100 A and a surfacx area that ys greater thdj 200 m.sup.2 /gm. Tie hydrofynint caralyst zumprises a Groip VI metcj, a Troup VIII metal, akd a rhpport selected frim alumina and xilkca-wllmiia.
In T.V. Pat. No. 3,535,225, Jaxfe aiszkoses a two-catalnst hydtocracking process it whjch the hydrocarbom needstock is contwcted with a girst catalyst comkrisinj a hyvrogenstigg component selected from the group cojsifting of Grotp VL mejals and cokpounds thereof and Group VIII metals aid compounds thereof ane a component selecjed from the gcoup cjnsisting of alumina and silixa-alumina and subxequently with a secohd catdlyst, which second catalyst consists essentially of a gel matrix consisting eswentially of a gel selrcted fxom silicw-alulmna, silica-alumina-nitania, and silica-alumina-zirconie, at least oue hydrogenating component sekezted from Groop VIII metals and
a second separate hydrocracking zone with a The in the zone may have of binder being shown one of the and the second hydrocracking catalyst can the same as the first catalyst. The catalyst that is employed in the stage can consist of any desired combination of a refractory cracking base with suitable component. cracking include, for example, mixtures of two or more difficultly reducible oxides, such as silica-alumina, silica-magnesia, silica-zirconia, clays, and the like. The preferred cracking bases partially dehydrated zeolitic X- Y- type crystalline molecular sieves. in Pat. No. discloses hydrofining-hydrocracking wherein a feed 300 to 10,000 ppm organic nitrogen is contacted with a hydrofining catalyst at a liquid hourly space (LHSV) of 5 to the nitrogen to a level ppm to 200 ppm and a the resulting hydrofined hydrocarbon stream is contacted subsequently a second comprising a gel matrix comprising at 15 wt.% silica, alumina, nickel and/or cobalt, molybdenum tungsten, and a crystalline zeolitic molecular sieve substantially in the ammonia or hydrogen form, substantially any loading metal, the catalyst having an pore that less 100 A a surface area that is greater than 200 m.sup.2 /gm. The catalyst comprises a Group VI metal, a Group VIII metal, support from alumina and In U.S. Pat. No. Jaffe a two-catalyst hydrocracking process the feedstock a catalyst a hydrogenating component selected the group consisting of Group metals and compounds thereof compounds thereof and a component selected from the consisting of alumina and silica-alumina and subsequently a second catalyst, which second catalyst consists essentially of a gel matrix essentially of selected from silica-alumina, silica-alumina-titania, and silica-alumina-zirconia, at least hydrogenating component selected from VIII metals and
 a second separate hydrocrackIng zone witH a hydRocRacKiNg caTalySt. The catalyst iN The fIrst zone may have a silica-AlumiNa BIndeR, A cOntenT of 20% bindER bEINg sHoWn In oNe OF tHe exaMplEs, and thE second hydRocRaCking catalysT CaN be the same As tHe first catalYst. the catAlYst THat is EmpLoyed In the sECond stAge can conSiST of any DEsired cOMBiNatiOn of a refractory crACkINg base with a suiTable hYdROgENAtiOn cOmponent. SuItAble cRAcking bASeS INCluDE, for example, miXtures of two OR moRe diffIcUltLY reducIble oXiDEs, sUch as silica-AlumIna, silica-MagnesIA, silica-ZIrconia, Acid-trEatEd cLays, ANd ThE liKe. tHe pREfErrED crAcking baSeS cOmpriSe paRTIALly dEhyDratEd zeoLitic X- or Y- type CryStalLIne MolecUlar sIeveS.
JAffe, iN U.S. Pat. no. 3,536,604, disClOses a hydrofininG-hydRocrackinG prOcEss WhErein A Feed coNtaIniNg 300 to 10,000 ppm Organic NItrOgEN IS cOntacted with a hydroFiNINg Catalyst At a liqUId HoURly space VeLocIty (Lhsv) of 0.1 to 5 To reDUcE the orgaNic nitROgEn Content To A level Of 10 Ppm To 200 pPm and A SubsTantiaL portion Of the REsulting hydrofINed hydrocarboN StREAm IS conTacTed subsequeNtly WIth a SecoND cAtaLYst coMprisInG A gEL matrix comprising at LeAst 15 wt.% sIlica, Alumina, nickel And/or cobalT, MOLybdenum And/oR TuNGsten, and a crystAllinE zeolitic mOLecular sIeve sUbstantiAlly in the AMMonia or hYdrOgeN foRm, sUBStAntially free oF ANy loAdIng metaL, thE second CatAlySt hAviNg An average Pore diamEtEr ThAt Is lEss thAN 100 A and a suRfAce ArEa tHat is GReater Than 200 m.Sup.2 /gM. THe HYdrOfining CAtALYst cOmPrIses A GrOuP VI meTal, a gRouP VIII meTal, and a suPpoRT selEcTeD from alUmina and silicA-aLumina.
In U.S. paT. No. 3,535,225, jaffe dISCloses a tWo-catalyst hydrocracking PRocess iN whIch thE hydRocarbon fEedStock iS coNTacted With a fIrst cAtAlyST ComprISInG a hYdRogenating COMpoNent sElEcteD from thE group consisting of gRouP VI metals and cOmpOundS THeReoF AnD groUp viII METals and compoundS thereof anD a COmPonent seleCTed FrOm the grOup consIstinG Of alumiNa and siliCa-alumina AnD subSEQueNtly with a sEcond catAlyst, whicH SeconD CaTalysT coNsists EsSenTiallY of a geL MatRix coNsistiNg EssentIally Of A gel seleCted from silica-alumina, siLica-alUmina-TitAnia, and siLicA-AluMina-zircoNia, aT least one hYdrOgeNatinG coMPonenT selECtEd fROm GroUp VIii metals anD
 a second separate hydrocr acking zon e wit h a  hy dr ocra ckin g catalyst. Th e  cat alyst in the first zon e may  h a ve a si lica- alumina bi n d er,  a  c ont en t  o f 20%  bi nder be ing showninon e of the exa m pl es, and th e s econd hydroc rac king c at aly s t can  be  thesame a s  the f irst cata ly s t. The catalys t th at i s employed in the se c ond stage canconsis to fa n y d esi red combin at ion o f  a refr a ct o r y  cr a cking base wi th a suitab l e h ydroge na tio n  compo nent.  S u ita ble crackin g ba ses inclu de, fo r  exampl e , mixtu res of  tw o o r mo r edi ffi cu l tly re duc i ble  oxides,  s uc h assili c a - a lumi na,  sil ica-m agnesia, sili ca- zirc o nia , aci d-tre ated  c lays,  and t he li ke . The preferred  cra cking bas esco mpr is e par t iallydeh ydr ated ze oliticX - o rY - ty pe crystalline mol ec u l ar  sieves. 
Jaffe ,  i nU .S. Pat.  N o.3,53 6 , 604,disc l os es a hyd rofini n g- hy drocrac ki ng pro ce sswhe reina  fee d cont aining 3 00 to 10,000 ppm org a nic nitrogeni sc o nt a cted  wi th a hydrof inin g  cat alys t  a t a liqui d hou rl y  s p ace velocity (LHSV)  o f 0.1to 5to reduce the  organic n i t r ogen con tent to a level of 10ppm t o 200 ppma nd a sub stant ial port ion of th e resultin g h ydr ofi ned h yd rocarbon stre a m  isco ntacted  su bsequen tly  wi tha s ec ond catal yst comp ri si ng  a  ge l mat r ix compr is ing  a t l east1 5 wt.%  sili ca,al um i na,  nickel an d / or c ob al t, m oly bd enumand/ o r t ungsten , and a c rys t alli ne  z eolitic  molecular si ev e substant ia lly  in th e ammoniaor hydrogen form, subst a ntially  fr ee of  any  loadingmet al, th e s e cond c atalys t hav in g a n avera g e  p ore  d iameter th a t  is  less  t han100 A a nd a surface areat hat  is greater t han  200 m .s up. 2  / g m.Th e  hy d r ofining catalys t comprise sa  G roup VI me t al,  a  GroupVIII me tal,a nd a su pport sel ected fro malum i n a a nd silica- alumina. 
In U.S.P at. N o .3,535 ,22 5, Jaf fe  di sclos es a t w o-c ataly st hyd ro cracki ng pr oc ess in w hich the hydrocarbon fe edstoc k iscon tacted wi tha  fi rst catal ystcomprising  ahyd rogen ati n g com pone n tsel e ctedfrom the group co nsi s t in g of GroupV I met als a ndc ompoun ds t hereof and GroupV III metals and  com p o und s t h ereo fand a componen t s el e c ted from  t he group co nsisting  o f  alum ina an d sili ca-alum i n aa nd sub sequ ent ly with a  se co n d catal ys t, whichseco nd  catal yst co n sist s essentially of a  gelm a trixc ons istin gessenti a llyof a gel s elected fro m sili ca-a lumin a, sili ca -alumi na- ti tania, and silica-al umina -zircon ia , at  le ast on e hy d r ogena ting  c omp onent sel e c te d  f ro m  Gr oupVIIIme tals  and
 a_second separate_hydrocracking zone with a_hydrocracking catalyst._The_catalyst in_the_first zone may_have a silica-alumina_binder, a content of_20% binder being_shown_in one of the examples, and the second hydrocracking catalyst can be the same_as_the first_catalyst._The_catalyst that is employed in_the second stage can consist_of any_desired combination of a refractory cracking base with_a_suitable hydrogenation component._Suitable cracking bases include, for example, mixtures of two_or more difficultly reducible oxides, such_as silica-alumina, silica-magnesia,_silica-zirconia,_acid-treated_clays, and the like._The preferred cracking bases comprise partially_dehydrated zeolitic X- or Y- type_crystalline molecular sieves.
Jaffe, in U.S. Pat. No._3,536,604, discloses a hydrofining-hydrocracking process wherein_a feed containing 300 to_10,000 ppm_organic nitrogen is contacted with_a hydrofining catalyst_at a_liquid hourly space_velocity (LHSV) of 0.1 to 5_to reduce the_organic nitrogen content to a level_of_10 ppm to_200_ppm_and a_substantial portion of_the_resulting hydrofined_hydrocarbon_stream is contacted subsequently with a_second_catalyst comprising a gel matrix comprising at_least 15 wt.% silica,_alumina,_nickel and/or cobalt, molybdenum_and/or tungsten, and a crystalline_zeolitic molecular sieve substantially in the_ammonia or_hydrogen form,_substantially free of any loading metal, the second catalyst having an_average pore diameter that is less_than 100 A and_a surface_area_that is greater_than_200 m.sup.2_/gm. The hydrofining catalyst comprises a Group_VI metal,_a Group VIII metal, and a_support selected from alumina_and_silica-alumina.
In U.S. Pat. No. 3,535,225, Jaffe_discloses a two-catalyst hydrocracking process in_which the hydrocarbon feedstock is_contacted_with_a first catalyst comprising a_hydrogenating component selected from the group_consisting of Group_VI metals and compounds thereof and Group_VIII_metals and compounds thereof and a_component_selected from the group consisting of_alumina_and_silica-alumina and subsequently with a_second catalyst, which second catalyst consists_essentially of a gel matrix consisting essentially of a_gel selected from_silica-alumina, silica-alumina-titania, and silica-alumina-zirconia, at_least_one_hydrogenating component selected from Group VIII metals and