ABSTRACT
Correction for 'Controlling CO2 hydrogenation selectivity by Rh-based catalysts with different crystalline phases of TiO2' by Fenghai Cao et al., Chem. Commun., 2022, 58, 4219-4222, https://doi.org/10.1039/D2CC00472K.
ABSTRACT
A series of Rh-based catalysts with various crystalline phases (p25, anatase, and rutile) were prepared via the incipient-wetness impregnation method. It was found that these catalysts had different metal-support interactions. Hence, 1%Rh/p, 1%Rh/r, and 1%Rh/a exhibited methane, CO, and methanol selectivity, respectively.
ABSTRACT
An elegant catalyst is designed via the encapsulation of metallic oxide Zn-Cr inside of zeolite SAPO34 as a core-shell structure (Zn-Cr@SAPO) to realize the coupling of methanol-synthesis and methanol-to-olefin reactions. It can not only break through the limitation of the Anderson-Schulz-Flory distribution but can also overcome the disadvantages of physical mixture catalysts, such as excessive CO2 formation. The confinement effect, hierarchical structure and extremely short distance between the two active components result in the Zn-Cr@SAPO capsule catalyst having better mass transfer and diffusion with a boosted synergistic effect. Due to the difference between the adsorption energies of the Zn-Cr metallic oxide/SAPO zeolite physical mixture and capsule catalysts, the produced water and light olefins are easily removed from the Zn-Cr@SAPO capsule catalyst after formation, suppressing the side reactions. The light olefin space time yield (STY) of the capsule catalyst is more than twice that of the typical physical mixture catalyst. The designed capsule catalyst has superior potential for scale-up in industrial applications while simultaneously extending the capabilities of hybrid catalysts for other tandem catalysis reactions through this strategy.
ABSTRACT
A ZnCrOx-ZnZSM-5 composite catalyst was used for CO2 hydrogenation into hydrocarbons especially aromatics (Aro). 81.1% Aro selectivity in C5+ hydrocarbons (mainly C5-11) was obtained at 320 °C, corresponding to 19.9% CO2 conversion, 29.8% total hydrocarbons (HCt) selectivity and 69.7% C5+ selectivity in HCt. Our optimized STY of Aro is the highest ever reported.
ABSTRACT
A kind of core-shell catalyst with Fe-Zn-Zr as the core and a zeolite (HZSM-5, Hbeta, and HY) as the shell was synthesized by a simple cladding method. The catalyst has an obvious confinement effect on the synthesis of isoalkanes by CO2 hydrogenation. Especially, the Fe-Zn-Zr@HZSM-5-Hbeta catalyst with a double-zeolite shell exhibits an extraordinary high i-HC/t-HC ratio.
ABSTRACT
OBJECTIVE: To evaluate the relationship between atherosclerotic brain infarction (ABI) and human leukocyte antigen DR (HLA-DR) gene at molecular level. METHODS: By using polymerase chain reaction sequence specific probe (PCR-SSP), gene special position of the HLA-II DR alleles were determined in 31 patients and 30 healthy individuals as controls, all of them were inhabitants of Northeastern China. RESULTS: The HLA-DR B1*0301 gene frequency in the group of ABI was obviously higher than that of control group (RR=5.6842, P<0.05). CONCLUSION: The HLA-DR B1*0301 gene may be the susceptible gene of ABI in Northeastern China, or it may associate with other genes to produce the disease.
Subject(s)
Brain Infarction/genetics , HLA-DR Antigens/genetics , Intracranial Arteriosclerosis/complications , Polymorphism, Genetic , Adult , Aged , Brain Infarction/etiology , Female , Genetic Predisposition to Disease , Humans , Male , Middle Aged , Polymerase Chain ReactionABSTRACT
OBJECTIVE: To determine whether the T27796C mutation in cystathionine beta-synthase (CBS) gene is associated with stroke in Chinese. METHODS: The T27796C mutation in CBS gene of 59 cases with stroke and 65 health controls were detected by polymerase chain reaction-restriction fragment length polymorphisms (PCR-RFLP). RESULTS: As this investigation shown, the frequencies of two alleles of T27796C mutation were followed: C was 56.8%, T was 43.2% in cases and C was 51.5%, T was 48.5% in controls. T27796C mutation had no obvious relativity to the stroke (P>0.05). There was no significant difference in frequency of alleles of this mutation between cases and controls (CC: 35.6% vs. 24.6%; CT: 42.4% vs. 53.8%; TT: 22.0% vs. 21.5%; all P>0.05). There was not obvious difference in frequency of alleles of this mutation between hemorrhagic patients and ischemic stroke patients (all P>0.05). CONCLUSION: T27796C mutation in CBS is not obviously correlated with stroke and this mutation is not associated with categories of stroke.