TWI373452B - Hydrocarbon conversion using nanocrystalline zeolite y - Google Patents

Hydrocarbon conversion using nanocrystalline zeolite y Download PDF

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Publication number
TWI373452B
TWI373452B TW094104075A TW94104075A TWI373452B TW I373452 B TWI373452 B TW I373452B TW 094104075 A TW094104075 A TW 094104075A TW 94104075 A TW94104075 A TW 94104075A TW I373452 B TWI373452 B TW I373452B
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Taiwan
Prior art keywords
zeolite
catalyst
oxide
alkylation
product
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TW094104075A
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English (en)
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TW200528397A (en
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Xingtao Gao
Johannes H Koegler
Lawrence L Murrell
Philip J Angevine
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Lummus Technology Inc
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • B01J29/085Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead
    • B01J29/088Y-type faujasite
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    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2/00Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
    • C07C2/54Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
    • C07C2/56Addition to acyclic hydrocarbons
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    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • B01J29/084Y-type faujasite
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • C01B39/00Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/04Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
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    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C6/00Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
    • C07C6/08Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond
    • C07C6/12Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring
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    • C10G29/00Refining of hydrocarbon oils, in the absence of hydrogen, with other chemicals
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    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
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    • C07C2529/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • C07C2529/10Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
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    • C07C2529/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
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    • C07C2529/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • C07C2529/16Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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1373452 ! · t (1) 九、發明說明 有關申請之交互對照 本申請案爲2002年2月5日提出申請的美國申請序號 1 0/067,7 1 9的部份追加案’其以引用方式倂於本文,且對 其主張優先權。 【發明所屬之技術領域】
本發明係有關一種烴化合物的轉化方法,且特別是有 關沸石觸媒對於烯烴/石蠟烷基化或芳族化合物烷基化之 用途。 【先前技術】 烷基化係有關將烷基化學添加到另一分子以形成更大 分子之製程。商業烷基化程序典型地可爲芳族烷基化或烯 烴/鏈烷烴烷基化。芳族烷基化典型地包括經由思(如 φφ ,乙烯,丙烯,等)將芳族化合物(如,苯)烷基化/製造 烷基芳族化合物)如,乙基苯,異丙苯,等)。烯烴/鏈烷烴 烷基化係屬在飽和烴與烯烴之間的反應以製造具有更高分 子量的高度分支飽和烴,例如,用2-丁烯將異丁烷予以烷 基化以製造具有高辛烷値之汽油產品。 - 與經由將高分子量石油餾份例如汽體油或石油殘渣予 以裂解產生汽油不相同者,烷基化可產生沒有硫或氮雜質 的更淸潔之汽油產品。再者,烷基化汽油具有很少或沒有 芳族化合物含量,其更具環境效益。 (2) 1373452 有多種烷基化方法係已知且用於整個石油工業者。例 如’於商業中經由使用液體酸觸媒例如硫酸或氫氟酸例常 地進行烷基化。或者,也有使用固體沸石觸媒者。沸石的 ' 使用可避免使用高腐蝕性和毒性液體酸之缺點。不過,沸 石可能患有被煉焦造成抑活化之缺點。多種使用含沸石觸 媒界烴-予\<烷基化之方法經揭示於美國專利第3,549,5 5 7和 1 5 之中。一種使用—用到沸石型或非沸石型材料 | 的一酸性固體觸媒之烷基化方法經揭示於美國專利第 • ^ 5,986,1>8/^,其以引用方式倂於本文。 . 沸石爲多孔型結晶型材料,其特徵在於具有特別尺寸 ' 及/或組態之次微觀通道。沸石典型地包括鋁矽酸鹽,不 ' 過沸石材料可用廣範圍的其他組成。後者常稱爲微孔型材 料。通道,或乙隙都經有序化且,因此之故,提供獨特性 質,使得沸石可用爲工業程序中的觸媒或吸收劑。例如, 可以用沸石來濾掉較小的分子,使小分子埋陷在沸石的孔 9φ隙中。此外,沸石可作爲形狀選擇性觸媒,有助於根據分 子反應物或產物的形狀或尺寸而在孔隙內進行的某些化學 轉化。沸石也被用於離子交換,例如用於水的軟化及重金 屬的選擇性回收。 合成型沸石傳流上係從氧化矽和鋁等來源(氧化砂和 - 氧化鋁a養分〃),在確保高等鹼性條件的材料,例如水 和0H·,之存在下,彼此反應。其他沸石可爲硼矽酸鹽, 鐵矽酸鹽,和類似者。許多結晶化步驟都在無機導引劑 (directing agent),或有機模板的存在中進行,彼等可誘 -6- (3) 1373452 f »
導出在沒有導引劑或模板存在中不能容易形成的特殊沸石 構造。許多有機模板都是季錢鹽,不過也可爲線型胺,醇 ,與多種其他化合物。如氫氧化物,某些導引劑可將經基 離子導到反應系統中;不過,鹼性常由氫氧化鈉(NaOH) ,氫氧化鉀(KOH),等的量所定。該反應典型地包括一液 體凝膠相,於其中發生重排和轉變,使得在氧化銘養分與 氧化矽養分之間發生重分布,且形成對應於特定沸石的分 子構造。也可以包括其他金屬氧化物,例如氧化鈦、氧化 矽、氧化硼-氧化矽,等。某些沸石只能用有機模板製成 。其他沸石只能利用無機導引劑製成。還有其他沸石可利 用親水性(如無機)導引劑或疏水性(有機基)模板任一者製 成。 有許多今日的烴加工技術係以沸石觸媒爲基礎者。有 多種沸石觸媒在技藝中爲已知者且擁有具一致孔隙尺寸的 排列良好之孔隙系統。術語A中間孔隙"係用於常指稱具 g^有4-6埃單位(A)的孔隙尺寸之沸石構造。^大孔隙〃沸石 ' 包括具有高於6至約1 2A的孔隙尺寸之構造。 由於以工業相關(亦即,高)轉化速率進行的許多烴加 工反應卻受限於質傳(特別者,粒子內擴散),因此具有理 想孔隙結構的觸媒粒子有助於反應物運送到粒子內的活性 - 觸媒部位及將產物從觸媒粒子運送出來,又仍可達到合意 的形狀選擇性催化作用。沸石形態學,亦即晶體尺寸’爲 擴散限制反應中的另一項參數。 觸媒具有有限的壽命,例如因爲煉焦所致•觸媒抑活 (4) 1373452 化常需要將反應器停機及將觸媒再生。雖然使用兩個反應 器以π擺動方式〃操作(亦即,兩反應器交錯使用,其中 一個操作烷基化,而另一個停機進行再生)可促成連續生 產,不過較佳者仍爲使用有長壽命的沸石觸媒實施烷基化 反應以使反應器停機與觸媒再生所致經濟損失減至最少。 【發明內容】
本發明提供一種用於將烴化合物烷基化之方法。該方 法包括提供一包括具有不小於1 00奈米的晶體尺寸的沸石 之觸媒:及將可烷基化的烴與烷化試劑在該觸媒存在中於 烷基化反應條件下反應以提供烷基化產物。 本文所述方法可有利地提供具有高硏究辛烷値(1 RON 〃)的烷基化產物以及有更長運轉時間的烷基化反應 【實施方式】 , 較佳具體實例之詳細說明 本文所述烷基化方法採用有超小,或奈米結晶,的晶 體尺寸,亦即不超過約100奈米("nm〃)的晶體尺寸,之 沸石。該奈米結晶型沸石擁有與某些烴轉化方法相關的數 - 項優點。例如,許多種反應物和產物的有效擴散率都可增 加。 第二’對於某些程序,尤其是依序性反應,於需要中 間產物者,可增進產物選擇率。例如,超小晶體尺寸可減 -8- (5) 1373452 低(1)過度裂解的量(例如,真空氣體油裂解所得(:3/(:4輕 質氣體產物的生產,於其中蒸餾物和石腦油產物都是所欲 產物)及(2)於芳族烷基化程序中的非所欲多烷基化之量。 • 此外,煉焦,及相體的觸媒抑活化,也會因奈米晶體沸石 使得進行中的逆行縮合反應之前促成焦油先質離開觸媒而 獲得減低。 第三,奈米晶型沸石觸媒的活性高於較大沸石晶體觸 ^ 媒,係因爲擴散限制使後述情況中的內部活性部份之可進 入者受到限制,導致奈米晶型沸石觸媒有較高有效數目的 . 活性部位每重量觸媒之故。 ' 下面要主要地關聯於以共有擁有,申請中的美國申請 - 序號10/067,719中所述方法製成的沸石Y對於烷基化催化 作用之用途來說明本發明方法。根據該申請序號 1 0/067,7 1 9所述方法製成的奈米晶型沸石Y具有立方體八 面沸石構造,具有約7至8A的有效孔隙直徑及小於25A的 φφ 單位晶胞尺寸。剛合成的沸石Υ也較佳地具有低於約1 0 ,常低於約7的氧化矽對氫化鋁莫耳比。奈米晶型沸石Υ 的晶體尺寸不超過約100奈米,較佳者不超過約50奈米, 且更佳者不超過約25奈米。 雖然奈米晶型沸石Υ的合成可在有機模板的存在中 . 進行’不過,以觸媒生產成本而論,較佳方式爲使用無機 導引劑。 奈米晶型沸石Υ可用於多種烴轉化程序中,例如乙 苯或異丙苯製造中的芳族烷基化和轉烷基化;生產高辛烷 -9- (6) 1373452 汽油所用的用烯烴將鏈烷烴烷基化;真空汽體油的加氫裂 解以生產運輪燃料:製造潤滑油基質儲料用的加氫處理, 線型烷基苯或烷基萘的製備:選擇性氫化:芳族硝化;等 製備奈米晶型沸石Y的方法包括將固體,多孔型氧 化矽-氧化鋁粒子或結構體與無機微孔隙形成性導引劑的 濃水溶液透過初起濕式浸漬予以浸漬。該多孔型氧化矽/ % 氧化鋁材料可爲非晶態或結晶型。液體的量爲比可能造成 ' 對肉眼可視察出的表面膠凝之量數爲少的量。提供給固體 ’多孔型氧化矽-氧化鋁粒子或構造體的液體會被後者的 內部空隙(voids)所吸收入且潤濕,但不會與彼等形成糊狀 材料。液體包括水,無機微孔隙形成性導引劑以及,需要 時,有機模板。
有機模板係根據合意產物而選擇的。可用於沸石合成 中的典型有機模板包括季銨鹽,線型胺和二胺,與醇。更 特定言之,特別的有機模板包括氫氧化四甲銨或其鹽,氫 氧化四乙銨或其鹽;氫氧化四丙銨或其鹽,吡咯烷,己 烷-1,6-二胺,己烷-1,6 -二醇,六氫吼畊,和18 -冠-6-
無機微孔隙形成性導引劑可提供氫氧離子且可爲鹼金 屬鹼或鹼土金屬鹼。不過,針對本發明沸石Y的製備而’ 言,較佳的微孔隙形成性導引機爲無機鹸金屬氫氧化物, 且較佳者爲氫氧化鈉(NaOH)。沒有使用有機模板。由於 高pH値對沸石Y形成比對其他晶相較有利’且有利於快 -10- (7) 1373452 速成核及結晶化,因此需要高濃度的苛性導引劑。例如, 在使用20重量%或更低濃度的NaOH時,可能會形成其他 晶相例如cancrinite或沸石p,不可能發生轉化,可能形 成太大的沸石Y晶體,或轉化可能要花一段不可接受的 長時間。
令人訝異地發現較高濃度的無機導引劑可明顯地減短 所需的反應時間。水溶液中較佳NaOH濃度範圍爲21重量 %至約60重量%,更佳者爲25重量%至約60重量%的NaOH 濃度。由於更高的NaOH濃度會導致極高黏度和不完全的 內部濕潤,此中間濃度範圍表一最佳含量》 爲維持^乾〃材料,該無機導引劑溶液的量不可超過 該多孔無機氧化物材料所具孔隙體積的1 00%,且較佳者 爲該孔隙體積的從約80%至約1 〇〇%。 浸漬均一度對於沸石Y的成功結晶化具有重要性。 局部化的不均勻性可能導致非一沸石Y副產物之形成。 爲了在小規模上提供適當的混合(例如,數克到1 0 0克範圍 內者),可以使用鉢將氧化矽-氧化鋁與微孔隙形成性導引 劑的溶液混合。於更大規模上,可以使用混合器與噴霧器 之組合。 然後將合倂的多孔型/非晶態氧化矽-氧化鋁與導引劑 (NaOH)的合成混合物置於一加熱介質中且加熱到從約50 °C至約1 5 0 °C,更佳者從約7 至約1 1 〇 °C的增溫。加成混 合物的均勻加熱係排列大沸石晶體的形成所需者。 將合成混合物將保持在合成濃度下一段足以將一充分 -11 - (8) 1373452 量的氧化矽-氧化鋁轉化爲沸石γ之時間。於結晶化後的 最後框架結構包含一實質的晶體含量(以重量計),典型地 爲至少15%,較佳者至少50%且最佳者從約75%至100%之 沸石。合成時期可決定於合成溫度,較低的合成溫度需要 較長的合成時間。合成時間可從5分至1 50小時,但更典型 者爲從10分鐘至48小時,且較佳者爲從約15分鐘至約30小 時。
於所需的合成時間之後,較佳者經由有效冷卻驟止合 成混合物。隨後,必須從產物移除微孔隙形成性導引劑以 防止於後面的處理步驟中或貯存中進一步反應。之後,必 須從沸石架構移除鈉。例如,經由與銨交換,使用諳於此 技者熟知的離子交換技術。 視需要地,可將沸石與一基質,黏合劑,或觸媒承載 體材料等摻合。此等材料包括氧化矽,氧化鋁,氧化矽鋁 ’氧化鈦,氧化锆和類似者。較佳者,本發明觸媒包括奈 米晶型沸石Υ和約5重量%至40重量%的耐火性氧化物黏合 劑例如氧化鋁,氧化矽,氧化矽-氧化鋁,氧化鈦,氧化 鉻,等。 離子交換沸石較佳者具有不超過約0.2重量%,更佳者 不超過0.1重量%,且又更佳者不超過約0.05重量%之鈉含 根據本發明方法製成的奈米晶型沸石Υ具有從約0.2 至約6.0的中孔隙至微孔隙體積比例,至少約275平方米/ 克的BET表面積和從約24.6Α至約24.9Α之單位晶胞尺寸 -12- (10) 1373452 烴予以烷基化。用丁烯或丁烯類混合物將異丁烷烷基化構 成本發明方法的一吸引性具體實例。 於另一具體實例中,本發明觸媒可用來將芳族化合物 • ,例如苯,用烯烴(如,乙烯,丙烯,1-丁烯,2-丁烯, 異丁烯,等)烷基化以製成對應的烷基芳族化合物(如,乙 苯,異丙苯,二-異丙基苯,等)。此外,該觸媒可用來用 裸環狀芳族化合物(如,苯)將多烷基化芳族化合物轉烷基 ^ 化以提供單烷基化芳族化合物。 如熟諳者所明顯知悉者,本發明方法可應用於任何適 當形式中,包括流體床方法,漿液法及固定床法。該方法 ' 可在多個床中進行,各床都分別給予烯烴添加。於此種情 - 況中,本發明方法可在每一分開的床中進行。 該烯烴-鏈烷烴烷基化法係在使將至少一部份烷化試 劑和可烷基化化合物處於液相或超臨界相中的條件下實作 。一般而言,本發明方法係在約-40 °C至約250 °C範圍內, φφ 較佳者在約5〇°C至約150°C範圍內,更佳者約75°C至約95 °C範圍內的溫度,及從1至1 00巴(bar),較佳者從1 0至40巴 ,更佳者從15至30巴的壓力下實作。反應器總進料中,可 烷基化性化合物對烷化試劑的莫耳比例較佳者爲高於5 : 1 ,更佳者高於50 : 1。烷化試劑的進料比例(WHSV)通常係 . 在〇.〇〗至5份範圍內,較佳者在0.05至0.5份範圍內,更佳 .者在0.1至0.4份範圍內的烷化試劑每份觸媒每小時。可烷 基化的飽和烴之WHSV較佳者係在0.1至SOOhr·1範圍內。 另一較佳方法爲芳族烷基化例如用乙烯將苯烷基化以 -14 -

Claims (1)

1375452 - ιοί 公告本 i___ ' 附件3A :第094104075號申請專利範圍修正本 民國101年7月9曰修正 十、申請專利範圍 1. 一種使烴化合物烷化之方法’其包括: a) 提供一包含具有不超過1〇〇奈米晶體尺寸的沸石Y 之觸媒; b) 使鏈烷烴與烯在該觸媒存在中於烷化反應條件下反
應而得烷化物產物, 其中該觸媒具有在WHS V爲0.26、至少6小時的烯失 效時所界定的壽命,且烷化物產物包括汽油產物,其中在 該觸媒壽命結束時所產收的該汽油產物具有至少100.0之 硏究法辛烷値,和其中該提供觸媒的步驟包括: a)提供一多孔型無機氧化物 b)用含有可提供氫氧根離子的無機微孔隙形成性導引 劑的液體溶液浸潰該多孔型無機氧化物,其中該液體溶液 的量不超過該無機氧化物的孔隙體積之100%,且該微孔 隙形成性導引劑在該液體溶液中的濃度爲從25重量%至60 Ο使該浸過的多孔型無機氧化物在高合成溫度下受熱 —段足以形成含沸石產物之持續時間》 2·如申請專利範圍第1項之方法,其中該鏈烷烴爲異 丁烷,且該烯爲丁烯。 3.如申請專利範圍第2項之方法,其中該烷化物產物 包括具有至少99.5的硏究法辛烷値之汽油。 1373452ιαι. 7. 9 4·如申請專利範圍第1項之方法’其中該烯爲選自乙 烯、丙烯、1-丁烯、2-丁烯、和異辛烯。 5. 如申請專利範圍第1項之方法,其中該烷化方法包 括轉烷化作用。 6. 如申請專利範圍第1項之方法,其中該無機微孔隙 形成性導引劑的液體溶液爲氫氧化鈉水溶液。 7. 如申請專利範圍第1項之方法,其中該沸石γ具有 不超過50奈米之晶體尺寸。 8. 如申請專利範圍第1項之方法,其中該沸石γ具有 不超過25奈米之晶體尺寸。 9. 如申請專利範圍第1項之方法,其中該沸石γ具有 不超過0.2重量%之鈉含量。 10. 如申請專利範圍第1項之方法,其中該沸石Υ具有 不超過0.1重量%之鈉含量。 11. 如申請專利範圍第1項之方法,其中該沸石Υ具有 不超過0.05重量%之鈉含量。 12. 如申請專利範圍第1項之方法,其中該觸媒包括— 耐火性氧化物黏合劑。 13·如申請專利範圍第12項之方法,其中該耐火性氧 化物黏合劑包括一或多種選自氧化矽、氧化鋁、氧化砂_ 氧化銘、氧化鈦和氧化锆之氧化物。 it如申請專利範圍第丨項之方法,其中該沸石γ包 括 或多種選自 Pt、Pd、Ir、Ru、Rh、Os' Fe、Co、Ni 、La' ce、pr、Ti、zr' Hf、V、Nb、Ta、Cr、Mo、W、 Cu' Ag和Au之金屬。 -2 - 101. 7. 9 1373452 15_如申請專利範圍第1項之方法,其中該沸石γ包括 鑭,且其中該鑭對沸石的質量比爲至少0.04。 16. 如申請專利範圍第1項之方法,其中該沸石γ具有 從0.2至0.6的中孔隙對微孔隙體積比。
17. 如申請專利範圍第1項之方法,其中該觸媒具有至 少275平方米/克之BET表面積,且其中該沸石γ具有稀 土金屬元素,稀土金屬對沸石的質量比爲至少0.04,其中 該沸石具有從0.2至6.0的中孔隙對微孔隙體積比,及從 24.6A至24.9A的單位晶胞尺寸。 1 8 ·如申請專利範圍第1項之方法,其中該烷化反應條 件包括從-4〇°C至25〇t的溫度,和從1巴(bar)至100巴之壓 力。
-3-
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