The development of noble-metal-free heterogeneous catalysts that can realize the aerobic oxidation of C–H bonds at low temperature is a profound challenge in the catalysis community. Here we report the synthesis of a mesoporous Mn0.5Ce0.5Ox solid solution that is highly active for the selective oxidation of hydrocarbons under mild conditions (100–120 °C). Notably, the catalytic performance achieved in the oxidation of cyclohexane to cyclohexanone/cyclohexanol (100 °C, conversion: 17.7%) is superior to those by the state-of-art commercial catalysts (140–160 °C, conversion: 3-5%). The high activity can be attributed to the formation of a Mn0.5Ce0.5Ox solid solution with an ultrahigh manganese doping concentration in the CeO2 cubic fluorite lattice, leading to maximum active surface oxygens for the activation of C–H bonds and highly reducible Mn4+ ions for the rapid migration of oxygen vacancies from the bulk to the surface.

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Purpose As supply chain sustainability has become more urgent than ever before, this study aims to provide a more nuanced understanding of how supplying firms’ sustainability motives influence their compliance and commitment, as well as sustainable performance, as they respond to buyers’ sustainable supplier management programs. Design/methodology/approach To investigate the intriguing links among sustainability motives, compliance/commitment and sustainable performance of supplying firms, this paper draws on multidisciplinary literature and collects empirical data from 281 supplying firms in China to test the proposed model and hypotheses using structural equation modeling. Findings Instrumental and moral motives make comparable contributions to compliance; moral motives exert stronger influence on firms’ commitment to sustainable practices. In addition, although compliance has a greater impact on economic and environmental performance, commitment is far more robust in improving environmental and social performance. Research limitations/implications Unlike most research on motives that has been theoretical, this study represents one of the few empirical analyses of how motives may affect sustainable performance. Examining the challenges from the perspectives of supplying firms, it also adds to the SSCM literature by making clear how compliance and commitment may differentially predict sustainable performance. Practical implications Although instrumental and moral motives can be complementary in advancing sustainable practices, it is imperative for firms to integrate moral considerations into sustainability decision-making and move beyond compliance, if they are to contribute meaningfully to a better society and cleaner environment. Originality/value This is the first large-scale empirical investigation on the links among motives, compliance, commitment and sustainable performance from the perspectives of suppliers.

Pretargeted imaging has emerged as ap romising approach to advance nuclear imaging of malignant tumors. Herein, we combine the enzyme-mediated fluorogenic reaction and in situ self-assembly with the inverse electron demand Diels-Alder (IEDDA) reaction to develop an activatable pretargeted strategy for multimodality imaging. The transcyclooctene (TCO) bearing small-molecule probe, P-FFGd-TCO,can be activated by alkaline phosphatase and in situ selfassembles into nanoaggregates (FMNPs-TCO)retained on the membranes,p ermitting to (1) amplify near-infrared (NIR) fluorescence (FL) and magnetic resonance imaging (MRI) signals,and (2) enrich TCOs to promote IEDDAligation. The Gallium-68 ( 68 Ga) labeled tetrazine can readily conjugate the tumor-retained FMNPs-TCO to enhance radioactivity uptake in tumors.S trong NIR FL, MRI, and positron emission tomography (PET) signals are concomitantly achieved,allowing for pretargeted multimodality imaging of ALP activity in HeLa tumor-bearing mice.

Various ZSM-5 zeolites modified with alkali metals (Li, Na, K, Rb, and Cs) were prepared using ion exchange. The catalysts were used to enhance the catalytic dehydration of lactic acid (LA) to acrylic acid (AA). The effects of cationic species on the structures and surface acid-base distributions of the ZSM-5 zeolites were investigated. The important factors that affect the catalytic performance were also identified. The modified ZSM-5 catalysts were characterized using X-ray diffraction, temperature-programmed desorptions of NH3 and CO2, pyridine adsorption spectroscopy, and N2 adsorption to determine the crystal phase structures, surface acidities and basicities, nature of acid sites, specific surface areas, and pore volumes. The results show that the acid-base sites that are adjusted by alkali-metal species, particularly weak acid-base sites, are mainly responsible for the formation of AA. The KZSM-5 catalyst, in particular, significantly improved LA conversion and AA selectivity because of the synergistic effect of weak acid-base sites. The reaction was conducted at different reaction temperatures and liquid hourly space velocities (LHSVs) to understand the catalyst selectivity for AA and trends in byproduct formation. Approximately 98% LA conversion and 77% AA selectivity were achieved using the KZSM-5 catalyst under the optimum conditions (40 wt% LA aqueous solution, 365 °C, and LHSV 2 h −1).

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Purpose As focal buyers implement sustainable supplier management (SSM) to advance their supply chain sustainability, the purpose of this paper is to provide a more nuanced understanding of how buyers’ use of power may incite varying perceptions of justice from suppliers that affect sustainable supplier performance (SSP). Design/methodology/approach This paper draws on multidisciplinary literature and collects empirical data from 181 supplying firms in China to examine the complex links among power use, justice, SSM, and sustainable performance using partial least squares structural equation modeling. Findings Both coercive and reward buyer power can facilitate SSM implementation and justice perception moderates the impact of SSM on SSP. Furthermore, coercive power adversely influences justice evaluation, thereby attenuating the effect of SSM on performance. Research limitations/implications This study complements and extends sustainable supply chain management research by evaluating SSM: on environmental, social and economic performance; from the perspectives of suppliers; and in an emerging market where many suppliers of Western firms are located. It also adds to behavioral SCM research by examining how buyers’ exercise of power might influence suppliers’ justice perception. Practical implications To implement SSM, focal buyers cannot simply issue codes of conduct to suppliers and ignore suppliers’ disposition to commit to standards. While coercive power might be convenient and tempting for buying firms, managers ought to be judicious in the use of coercion. Originality/value This is the first large-scale empirical investigation on the links among power use, justice, SSM and sustainable performance from the perspectives of suppliers in an emerging economy.

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