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We search for far-infrared (FIR) counterparts of known supernova remnants(SNRs) in the Galactic plane (10 deg <| l |< 60 deg) at 70-500 micron using theHerschel Infrared Galactic Plane Survey (Hi-GAL). Of 71 sources studied, wefind that 29 (41 per cent) SNRs have a clear FIR detection of dust emissionassociated with the SNR. Dust from 8 of these is in the central region, and 4indicate pulsar wind nebulae (PWNe) heated ejecta dust. A further 23 have dustemission in the outer shell structures which is potentially related to swept upmaterial. Many Galactic SNe have dust signatures but we are biased towardsdetecting ejecta dust in young remnants and those with a heating source (shockor PWN). We estimate the dust temperature and mass contained within three PWNe,G11.2-0.3, G21.5-0.9, and G29.7-0.3 using modified blackbody fits. To morerigorously analyse the dust properties at various temperatures and dustemissivity index beta, we use point process mapping (PPMAP). We findsignificant quantities of cool dust (at 20-40 K) with dust masses of Md = 0.34+/- 0.14 solar mass, Md = 0.29 +/- 0.08 solar mass, and Md = 0.51 +/- 0.13solar mass for G11.2-0.3, G21.5-0.9, and G29.7-0.3 respectively. We derive thedust emissivity index for the PWN ejecta dust in G21.5-0.3 to be beta = 1.4 +/-0.5 compared to dust in the surrounding medium where beta = 1.8 +/- 0.1.

A Catalogue of Galactic Supernova Remnants in the far-infrared: revealing ejecta dust in pulsar wind nebulae