Tunning valence state of cobalt centers in Cu/Co-CoO for significantly boosting water-gas shift reaction.

Dual active sites with synergistic valence state regulation under oxidizing and reducing conditions are essential for catalytic reactions with step-wise mechanisms to modulate the complex adsorption sites of reactant molecules on the surfaces of heterogeneous catalysts with maximized catalytic performances, but it has been rarely explored. In this work, uniformly dispersed CuCo alloy and CoO nanosheet composite catalysts with dual active sites are constructed, which shows huge boost in activity for catalyzing water-gas shift reaction (WGSR), with a record high reaction rate reaching 204.2 μmol g s at 300 °C for CuCoO amongst the reported Cu-based and Co-based catalysts.

[Posterior lumbar intervertebral fusion device and a new transpedical screw system for treatment of lumbar spondylolisthesis].

Objective: To observe the effect of posterior lumbar intervertebral fusion (PLIF) device and a novel transpedical screw system for the treatment of lumbar spondylolisthesis.

Methods: Thirty-three patients with lumbar spondylolisthesis were treated with PLIF device for intervertebral fusion after total laminectomy and internal fixation with the novel transpedical screw system.

Results: The patients were followed up for 6 to 36 months with an average of 18.