CN115041223B - 一种直接催化裂解原油制低碳烯烃催化剂的制备方法 - Google Patents
一种直接催化裂解原油制低碳烯烃催化剂的制备方法 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 36
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 19
- 239000010779 crude oil Substances 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005336 cracking Methods 0.000 title claims abstract description 11
- 239000002808 molecular sieve Substances 0.000 claims abstract description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000011593 sulfur Substances 0.000 claims abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 18
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052621 halloysite Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 238000004537 pulping Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 235000005074 zinc chloride Nutrition 0.000 claims description 8
- 239000011592 zinc chloride Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
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- 239000000243 solution Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 238000003483 aging Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 239000011574 phosphorus Substances 0.000 abstract description 4
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- 230000002378 acidificating effect Effects 0.000 abstract description 2
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000004523 catalytic cracking Methods 0.000 description 9
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- 229910052723 transition metal Inorganic materials 0.000 description 2
- GGKNTGJPGZQNID-UHFFFAOYSA-N (1-$l^{1}-oxidanyl-2,2,6,6-tetramethylpiperidin-4-yl)-trimethylazanium Chemical compound CC1(C)CC([N+](C)(C)C)CC(C)(C)N1[O] GGKNTGJPGZQNID-UHFFFAOYSA-N 0.000 description 1
- 101710194905 ARF GTPase-activating protein GIT1 Proteins 0.000 description 1
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- 101710081758 High affinity cationic amino acid transporter 1 Proteins 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 108091006231 SLC7A2 Proteins 0.000 description 1
- 108091006230 SLC7A3 Proteins 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
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- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
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- 150000005671 trienes Chemical class 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/405—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
- C07C4/06—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
本发明公开了一种直接催化裂解原油制低碳烯烃催化剂的制备方法,针对原油组成复杂,轻重组分同时裂解困难,催化剂稳定性差且低碳烯烃收率低的问题,合成两种功能不同的材料,一种为层状结构的碱性材料,兼具硫转移、抗金属污染和助燃功能,应对原油的金属和硫含量高的问题;一种为酸性材料,酸液对天然矿石筛选料进行改性后兼具粘结作用,减少磷元素在ZSM‑5分子筛上的团聚堵孔,碱处理的高硅铝比ZSM‑5分子筛具有畅通的孔道和更高的低碳烯烃选择性。
Description
技术领域
本发明涉及一种直接催化裂解原油制低碳烯烃催化剂的制备方法,属于催化剂制备领域。
背景技术
随着新能源汽车的大力推广,对汽油的需求日益减少,而低碳烯烃等作为基础化工原料的需求增长迅速,石化行业面临由生产成品油向多产化工品转型。
目前生产低碳烯烃的工艺主要有石油催化、蒸汽裂解、甲醇制烯烃等。甲醇制烯烃投资大,产品结构单一,CO2排放量大(是石脑油制烯烃过程的7倍),不利于碳中和的战略目标。在碳中和战略目标影响下,甲醇制烯烃工艺将受到极大限制,而石油裂解制烯烃更有发展前景。催化裂解石油制烯烃所需温度相对较低、能耗低、原料适用性广,是未来生产低碳烯烃的重要途径。
原油是一个宽馏分、成分复杂的烃类混合物,包含有链烷烃、环烷烃、芳烃等物质,碳数也有长有短,不同的馏分需要的裂解条件是完全不同的。轻组分需要高温、高活性,重组分应低温、低活性,如果不加以考虑,就会产出非理想产物,降低经济效益。
催化剂的性质决定裂解性能以及产物分布,活性分子以ZSM-5为主,但ZSM-5的孔口只有0.53*0.56,大分子无法直接进入,因此需要原油大分子预裂化或热裂解后才可以。此外,反应过程中ZSM-5水热稳定性差,遇水容易骨架脱铝,也易积碳而覆盖活性位点、堵塞孔道,导致催化剂稳定性差、反应活性降低。针对以上问题,学者们开展了大量研究,发现可以通过调控催化剂的孔结构,制备多级孔结构分子筛催化剂或将ZSM-5与大孔结构的Y分子筛复配;再者,通过稀土金属、过渡金属改性ZSM-5分子筛,改善其表面酸强度和密度,提高催化剂活性和稳定性。最佳组合方案是,低活性,弱/少酸性中心的基质材料,惰性基质的ZSM-5颗粒。
CN113385223A提供了一种直接催化裂解原油增产低碳烯烃的催化剂及其制备方法,所述催化剂包含5%-20%Y型分子筛,20%-50%的磷和锆改性ZSM-5分子筛,10%-40%载体,5%-25%粘结剂。该催化剂用于原油直接催化裂解过程中能抑制二次反应的发生、提高产物中低碳烯烃的收率,具有较好应用前景。
CN113546672A公开了一种催化裂解催化剂,该催化剂包括:改性ZSM-5分子筛和粘结剂以及任选的粘土;所述催化剂在应用于裂解反应中时裂解能力更强,低碳烯烃的收率更高且丙烯选择性更高
CN112642470A公开了一种用于催化裂解的催化剂及其制备方法。活性组份为金属掺杂的HZSM-5分子筛,所述金属为钨元素和过渡金属元素Mn、Cr、Ti的一种,具有耐高温、高活性、较大比表面积等特点,其多级孔结构有利于降低反应物分子在孔道内的扩散阻力,提高反应物分子与催化剂活性位点接触概率,从而提高烯烃、芳烃等产物产率。
CN114425431A公开了一种含磷改性MFI结构分子筛的催化裂解催化剂,含有Y型分子筛、磷改性MFI结构分子筛,其中,所述的磷改性MFI结构分子筛,其K值满足:70%≤K≤90%,所述的K=P1/P2×100%,其中,P1表示采用XPS方法测定的分子筛晶粒的任意晶面垂直深度0~2nm内、100平方纳米区域面积内的磷质量含量,P2表示采用EPMA方法测定的分子筛晶粒的任意晶面垂直深度5~10nm厚度区间100平方纳米区域面积内的磷质量含量。
CN114433215A公开了一种加氢渣油催化裂解催化剂及其制备方法和应用,该催化剂含有50-80重量%的载体、4-20重量%的Y型分子筛、10-25重量%的具有MFI结构的分子筛和5-15重量%的孔道开口直径为0.65-0.7纳米的分子筛;该催化剂用于加氢渣油的催化裂解反应,具有更高的重油转化率和低碳烯烃产率。
但石油催化裂解技术存在原油组成复杂,轻重组分同时裂解困难,催化剂稳定性差且低碳烯烃收率低的问题。对催化剂本身来说其最佳组合方案是:低活性、弱/少酸性中心的基质材料和/或惰性基质的ZSM-5颗粒。
发明内容
针对现有技术存在的一些问题,本发明的目的是提供一种废料转化油品催化剂的制备方法。本发明所述制备方法其步骤具体如下:
(1)一定比例的轻质氧化镁颗粒分散至三氯化铝溶液中,搅拌均匀后加氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入一定比例的磷酸,该浆液记做A;
(2)多水高岭土加入到浓磷酸/硫酸混合溶液中,搅拌大于60分钟,加入ZSM-5分子筛和铝溶胶,该浆液记做B;
(3)浆液A和B按照一定比例分别进入干燥塔进行造粒,焙烧和过滤洗涤;
(4)滤饼重新打浆,加入氯化亚铈和氯化锌,过滤后干燥,即得标题物。
步骤(1)中轻质氧化镁和氯化铝加入比例以氧化物的质量计MgO:Al2O3=1.8-3.3:1,磷酸的加入量以H3PO4计与以Al2O3计的三氯化铝的质量比为(0.01-0.09):1
步骤(2)中磷酸的加入量以P2O5计与多水高岭土干基的质量比为0.20-0.40:1,ZSM-5分子筛的加入量以干基计与多水高岭土干基的质量比为1.05-1.15:1,铝溶胶的加入量以Al2O3计与多水高岭土干基的质量比为0.12-0.15:1。
步骤(2)中ZSM-5分子筛硅铝比大于200,介孔比表面占总比表面的10%以上。
步骤(3)中A的加入量以MgO计与原料油中金属、硫和残炭关联式为210×(2V+0.25Ni+Fe+Na+Ca)wt%+45×Swt%+1.45×CCRwt%。
步骤(4)中氯化亚铈的加入量以CeO2计为(0.18-0.25)×MgOwt%,氯化锌的加入量以ZnO计为(0.02-0.05)×ZSM-5wt%。
具体实施方式:
下面将结合实施例对本发明进一步说明,需要说明的是以下所述的实施例仅仅是本发明的一部分实施例,并不意味着是对本发明范围的限制。
所用原材料均为工业级,取自青岛惠城环保科技股份有限公司。
实施例1
(1)667.2g的轻质氧化镁(灼减为1.5%)颗粒分散至6666ml三氯化铝溶液(Al2O3=50g/L)中,搅拌均匀后加12wt%的氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入17.8g的75wt%磷酸,该浆液记做A;
(2)584.6g的多水高岭土(灼减为35%)加入到246.8g的85wt%磷酸/硫酸混合溶液中,搅拌大于60分钟,加入440g的ZSM-5分子筛(灼减为5%)和227.3g铝溶胶((Al2O3=22wt%),该浆液记做B;
(3)浆液A和B按照17.8:82.2(干基)的比例分别进入干燥塔进行造粒,焙烧和过滤洗涤;
(4)滤饼重新打浆,加入197.5g的氯化亚铈(CeO2=12wt%)和68.7g的氯化锌(ZnO=10wt%),过滤后干燥,该催化剂记做CAT-1。
实施例2
(1)724.9g的轻质氧化镁(灼减为1.5%)颗粒分散至5720ml三氯化铝溶液(Al2O3=50g/L)中,搅拌均匀后加12wt%的氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入26.7g的75wt%磷酸,该浆液记做A;
(2)615.4g的多水高岭土(灼减为35%)加入到146.1g的85wt%磷酸/硫酸混合溶液中,搅拌大于60分钟,加入473.7g的ZSM-5分子筛(灼减为5%)和272.7g铝溶胶((Al2O3=22wt%),该浆液记做B;
(3)浆液A和B按照16.5:83.5(干基)的比例分别进入干燥塔进行造粒,焙烧和过滤洗涤;(4)滤饼重新打浆,加入246.9g的氯化亚铈(CeO2=12wt%)和112.7g的氯化锌(ZnO=10wt%),过滤后干燥,该催化剂记做CAT-2。
实施例3
(1)761.4g的轻质氧化镁(灼减为1.5%)颗粒分散至5000ml三氯化铝溶液(Al2O3=50g/L)中,搅拌均匀后加12wt%的氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入30.0g的75wt%磷酸,该浆液记做A;
(2)584.6g的多水高岭土(灼减为35%)加入到227.3g的85wt%磷酸/硫酸混合溶液中,搅拌大于60分钟,加入452.6g的ZSM-5分子筛(灼减为5%)和227.3g铝溶胶((Al2O3=22wt%),该浆液记做B;
(3)浆液A和B按照15.8:84.2(干基)的比例分别进入干燥塔进行造粒,焙烧和过滤洗涤;
(4)滤饼重新打浆,加入177.8g的氯化亚铈(CeO2=12wt%)和144.8g的氯化锌(ZnO=10wt%),过滤后干燥,该催化剂记做CAT-3。
实施例4
(1)724.9g的轻质氧化镁(灼减为1.5%)颗粒分散至5720ml三氯化铝溶液(Al2O3=50g/L)中,搅拌均匀后加12wt%的氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入19.1g的75wt%磷酸,该浆液记做A;
(2)615.4g的多水高岭土(灼减为35%)加入到129.9g的85wt%磷酸/硫酸混合溶液中,搅拌大于60分钟,加入484.2g的ZSM-5分子筛(灼减为5%)和272.7g铝溶胶((Al2O3=22wt%),该浆液记做B;
(3)浆液A和B按照16.5:83.5(干基)的比例分别进入干燥塔进行造粒,焙烧和过滤洗涤;
(4)滤饼重新打浆,加入217.3g的氯化亚铈(CeO2=12wt%)和192.1g的氯化锌(ZnO=10wt%),过滤后干燥,该催化剂记做CAT-4。
评价使用自建的提升管反应器,催化剂藏量10公斤,提升管高度11.5m,反应温度600℃,剂油比13。
评价所用原料油性质如下:
表1原料油基本性质
评价结果如下:
使用本发明的催化剂,均获得较高的三烯收率,具有较好的应用价值。
Claims (2)
1.一种直接催化裂解原油制低碳烯烃催化剂的制备方法,其具体制备步骤如下:
(1)一定比例的轻质氧化镁颗粒分散至三氯化铝溶液中,轻质氧化镁和氯化铝加入比例以氧化物的质量计,MgO:Al2O3=1.8-3.3:1,搅拌均匀后加氨水调pH值大于9.0,升温陈化3-6个小时,过滤、洗涤后滤饼重新打浆,并加入一定比例的磷酸,磷酸的加入量以H3PO4计,与以Al2O3计的三氯化铝的质量比为(0.01-0.09):1,该浆液记做A;
(2)多水高岭土加入到浓磷酸/硫酸混合溶液中,磷酸的加入量以P2O5计,与多水高岭土干基的质量比为0.20-0.40:1,搅拌大于60分钟;加入ZSM-5分子筛和铝溶胶,ZSM-5分子筛的加入量以干基计,与多水高岭土干基的质量比为1.05-1.15:1,铝溶胶的加入量以Al2O3计,与多水高岭土干基的质量比为0.12-0.15:1,该浆液记做B;
(3)浆液A和B按照一定比例分别进入干燥塔进行喷雾造粒,A的加入量以MgO计与原料油中金属、硫和残炭关联式为210×(2V+0.25Ni+Fe+Na+Ca)wt%+45×Swt%+1.45×CCRwt%,收集的催化剂颗粒需经过焙烧和过滤洗涤处理;
(4)滤饼重新打浆,加入氯化亚铈和氯化锌,氯化亚铈的加入量以CeO2计为(0.18-0.25)×MgOwt%,氯化锌的加入量以ZnO计为(0.02-0.05)×ZSM-5wt%过滤后干燥,即得催化剂。
2.根据权利要求1所述的制备方法,其特征在于步骤(2)中ZSM-5分子筛硅铝比大于200,介孔比表面占总比表面的10%以上。
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