DEVELOPMENT OF BIFUNCTIONAL CATALYSTS BASED ON Ni AND K-Li2ZrO3 FOR SORPTION ENHANCED STEAM REFORMING OF ETHANOL

DIANA PELTZER; MARCELA JARAMILLO BAQUERO; LAURA CORNAGLIA; JOHN MÚNERA

Cancún

Congreso; XXX International Material Research Congress; 2022

Sociedad Mexicana de Materiales

A set of sorbents with nominal M/Zr ratio (M=Li+K) 1.68:1 to 1.21:1, labeled as KLiZr_x (x=a, b, c,d, and e, respectively) were synthesized through wet co-impregnation of alkaline solutions in asuspension of zirconia nanoparticles (NYACOL®). A bi-functional catalyst (NiKLiZr) was synthesizedusing the same technique and incorporating 5% p/p of NiO, with M/Zr ratio=1.34 (M=Ni+K+Li).Structural Raman and XRD characterization was performed. Sorption tests were carried out at 500ºC with 50% CO2 (total pressure: 1 atm.) during 30 (short) or 60 (long) minutes, in a fixed-bedreactor coupled to a CO2-detection system. SESRE was performed with 60 mg of catalyst, feeding aWater/ethanol=5 (W/F = 1.7 × 10-2 g h L-1). The outlet gases were analyzed using gaschromatography.Li2ZrO3 and ZrO2 phases were observed by Raman and XRD. The qualitative Li2ZrO3/ZrO2 ratioscalculated the XRD patterns were lower at higher ZrO2 contents. The sorbents presented improvedcapture properties with the decreasing of the nominal M/Zr ratio. Specially, during short tests, thesamples with higher Zr contents reached higher “measured capture capacity/theoretical capturecapacity” ratios, 0.56 to 0.86. Taking this into account, a bifunctional solid was designed taking thenominal composition of KLiZr_e (M/Zr=1.21) and replacing 5% p/p of ZrO2 with NiO. The solid wastested in SESRE presenting ethanol conversions between 75-85% with H2-yielding about 70%. Thematerial was active and selective to H2, maintaining high conversions for at least 7 hours. Theobtained results can provide a basis for the development of new bifunctional materials for theSESRE.