Zeolite Catalysis

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Zeolite Catalysis ( zeolite-catalysis )

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16 Reaction Reactor Type Feed Operating Conditions Table 1. Cont. Catalyst Membrane XCR (%) SCR (%) YCR (%) XMR (%) SMR (%) YMR (%) References High-temperature water gas shift reaction carbon PBMR monoxide, water 400–550 ◦C H2O/CO = 1.0–3.5 WHSV = 7500–60,000 h−1 p = 2–6 atm sweep gas: nitrogen Fe/Ce MFI/α-Al O 2 3 disc X CO = ~90 X > 95 CO [154,155] Water gas shift reaction carbon PBMR monoxide, water 500 ◦C p = 5 atm H2O/CO = 3.0−1 Fe-Cr-Cu ZSM-5/silicalite bilayer/α-Al2O3 n.r. XCO = 89.8 [156] High-temperature water gas shift reaction carbon PBMR monoxide, hydrogen, 300–450 ◦C pfeed = 0.1–0.15 MPa pperm = 0.1 MPa sweep gas: steam Fe2O3/Cr2O3/Al2O3 MFI/α-Al2O3 hollow fibre XCO = 63.4 XCO = 73.6 Sperm. only = 100 [157] Xylene isomerization PBMR m-xylene diluted in nitrogen 577 K sweep gas: nitrogen in counter-current mode Pt on zeolite MFI/α-Al2O3 tube Sp-xylene = 58 Yp-xylene = 21 Sperm.+Ret. = 65 Yp-xylene = 23 [158] Xylene isomerization pure m-xylene; CMR carrier gas: 300–400 ◦C sweep gas: nitrogen H-ZSM-5/316L stainless steel disc Pt/H-ZSM-5/stainless steel tube Xm-xylene = 5.87 Sp-xylene = 55.6 So-xylene = 44.4 Xm-xylene = 6.9 Sp-xylene = 66.7 So-xylene = 33.3 [159] [160] Xylene isomerization CMR m-xylene diluted in helium 370 ◦C sweep gas: nitrogen n.r. Sp-xylene = 67 Xylene isomerization mixture of m-, p- PBMR and o-xylene 340–390 ◦C WHSV = 550 h−1 Pt/H-ZSM-5 Ba-ZSM-5/ Stainless steel S p-xylene = 52 S = 69 p-xylene [160] steam and nitrogen steam GHSV = 72,000 h sweep gas: argon preheated steam nitrogen carrier gas: hydrogen

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