| Full text | |
| Author(s): |
Petrolini, Davi D.
[1]
;
Marcos, Francielle F. C.
[2]
;
Lucredio, Alessandra F.
[1]
;
Mastelaro, Valmor R.
[3]
;
Assaf, Jose M.
[4]
;
Assaf, Elisabete M.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense, 400, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Escola Politecn, Ave Prof Luciano Gualberto, T 3, 380, BR-05508010 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Sao Carlos Inst Phys, Ave Trabalhador Sao Carlense, 400, BR-13560970 Sao Carlos, SP - Brazil
[4] Univ Fed Sao Carlos, Rod W Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | CATALYSIS SCIENCE & TECHNOLOGY; v. 11, n. 13, p. 4471-4481, JUL 7 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
The oxidative coupling of methane reaction to produce C-2 compounds was studied using La-2(Ce1-xMgx)(2)O7-delta catalysts with disordered defective cubic fluorite structures, varying the Mg content (0.0 <= x <= 1.0), CH4/O-2 ratio, temperature, and WHSV. The partial substitution of Ce by Mg in the structure modified the morphology, adjusted the reducibility, stabilized the Ce3+ species, and provided different concentrations of basic sites, which allowed a 42% increase in the yield of C-2, with ethylene as the major product. The catalyst with 0.4 Mg content in the structure provided C-2 selectivity of 52%, with CH4 conversion of 28%, even under conditions richer in O-2. The highest selectivity to C-2 (75%), with the highest selectivity to ethylene (39.1%), was achieved using a CH4 : O-2 ratio of 8 : 1. In addition, it was possible to operate at milder temperatures (650 degrees C), with satisfactory CH4 conversion (22%) and C-2 selectivity (54%). By decreasing the space velocity, the CH4 conversion and C-2 selectivity decreased with an ethylene/ethane ratio of 3. The inhibitory effects of H2O and CO2 were observed at lower space velocity. (AU) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 17/08293-8 - Project 14: direct synthesis of methanol from CO2 |
| Grantee: | Francielle Candian Firmino Marcos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/10980-9 - Oxidative Coupling of Methane using A2B2O7 catalysts |
| Grantee: | Davi Domingos Petrolini |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery |
| Grantee: | Marcelo Zaiat |
| Support Opportunities: | Research Projects - Thematic Grants |