Efficient methanol steam reforming over ZnCeZrO_x: the unique role of cerium

Abstract

Metal oxide catalysts have been widely used in steam reforming of methanol (SRM), but facing the challenge of long-term running. Herein, we report a ZnCeZrOx catalyst that can operate in...

Methanol Steam Reforming for Hydrogen Production over CuZnZrOx: Promotion Effect of Cu

“…29−31 Recently, our group found that ZnZrO x solid solutions rich in Ov is capable of dissociating H 2 O at temperatures above 200 °C. 32 Our and other's work suggest that (mixed) metal oxides catalyze SRM mainly through the HCOOH pathway. 32−34 Based on previous results, it is reasonable to presume that enhancing the decomposition activity of formate species and migration rate of H species may be one of the efficient approaches to increase the low-temperature SRM activity of (mixed) metal oxides.…”

“…Previous studies suggest that mixed metal oxides with solid solution structure rich in oxygen vacancies (Ov) are favorable for H 2 O dissociation and Ov is the main site for H 2 O dissociation. − Recently, our group found that ZnZrO x solid solutions rich in Ov is capable of dissociating H 2 O at temperatures above 200 °C . Our and other’s work suggest that (mixed) metal oxides catalyze SRM mainly through the HCOOH pathway. − Based on previous results, it is reasonable to presume that enhancing the decomposition activity of formate species and migration rate of H species may be one of the efficient approaches to increase the low-temperature SRM activity of (mixed) metal oxides. Compared to (mixed) metal oxides, supported metal catalysts are more efficient in the decomposition of intermediate formate species and in the migration of H species …”

Enhancing the Stability of Methanol-to-Olefins Reaction Catalyzed by SAPO-34 Zeolite in the Presence of CO2 and Oxygen-Vacancy-Rich ZnCeZrOx

“…Compared with ZrO 2 (20.9%), introducing Zn induced the formation of oxygen vacancies as the surface O V concentration increased to 23.4% . This number was further increased to 27.1% following the introduction of Ce, which was due to the presence of Ce 3+ . , …”

“…38 This number was further increased to 27.1% following the introduction of Ce, which was due to the presence of Ce 3+ . 39,40 The relative concentration of the O V was further analyzed by capturing unpaired electrons in EPR measurements, and the results are shown in Figure 3b. The signal at g = 2.003 corresponded to electrons trapped on O V .…”

Catalytic hydrogen storage in liquid hydrogen carriers

“…HCOOH is produced from the reaction of HCHO with OH species and decomposes into CO 2 and H 2 subsequently. In the later work, the promotion effect of Ce on ZnZrO x was studied by Li et al 234 Characterization results from XRD and Raman show that Zn and Ce incorporate in the lattice of t -ZrO 2 , forming ternary solid solutions in the composition range studied. Zn 1 Ce 0.5 Zr 9 O x appears to be more active than the Zn 1 Zr 10 O x and Zn 1 Ce 10 O x , achieving methanol conversion of 99.8% at 400 °C.…”